By eating plants and other animals, because they obtain their carbon from food.
What can be inferred from this excerpt is : ( D ) Individuals with favorable variations survive and reproduce.
<h3>Effects of genetic variations in species</h3>
When the insecticide was sprayed some of the cockroaches survived and continued reproduction due to their resistance to the spray.Therefore it can inferred that although the cockroaches share the same genetic materials, the variations in individuals within the same specie played a role in the survival of some of the cockroaches.
Hence we can conclude Individuals with favorable variations survive and reproduce.
Learn more about genetic variations : brainly.com/question/14926046
Most plants only need carbon dioxide so they only need humans
The carbon that plants need for photosynthesis comes from (carbon dioxide gas in the atmosphere)
